<template>
  <div class="app-container">

    <!-- 查询和其他操作 -->
    <div class="filter-container">
      <el-input v-model="listQuery.title" clearable class="filter-item" style="width: 200px;" placeholder="请输入专题标题"/>
      <el-input v-model="listQuery.subtitle" clearable class="filter-item" style="width: 200px;"
                placeholder="请输入专题子标题"/>
      <el-select v-model="listQuery.sort" class="filter-item" placeholder="请选择排序字段">
        <el-option v-for="item in options" :key="item.value" :label="item.label" :value="item.value"/>
      </el-select>
      <el-button v-permission="['GET /admin/topic/list']" class="filter-item" type="primary" icon="el-icon-search"
                 @click="handleFilter">查找
      </el-button>
      <el-button :loading="downloadLoading" class="filter-item" type="primary" icon="el-icon-download"
                 @click="handleDownload">导出
      </el-button>
    </div>

    <div class="operator-container">
      <el-button v-permission="['POST /admin/topic/create']" class="filter-item" type="primary" icon="el-icon-edit"
                 @click="handleCreate">添加
      </el-button>
      <el-button v-permission="['GET /admin/topic/batch-delete']" class="filter-item" type="danger"
                 icon="el-icon-delete" @click="handleBatchDelete">批量删除
      </el-button>
    </div>

    <!-- 查询结果 -->
    <el-table v-loading="listLoading" :data="list" element-loading-text="正在查询中。。。" border fit highlight-current-row
              @selection-change="handleSelectionChange">
      <el-table-column type="selection" width="55"/>

      <el-table-column align="center" label="专题标题" prop="title"/>

      <el-table-column align="center" label="专题子标题" min-width="200" prop="subtitle"/>

      <el-table-column align="center" property="picUrl" label="图片">
        <template slot-scope="scope">
          <img :src="scope.row.picUrl" width="80">
        </template>
      </el-table-column>

      <el-table-column align="center" label="专题详情" prop="content">
        <template slot-scope="scope">
          <el-dialog :visible.sync="contentDialogVisible" title="专题详情">
            <div v-html="contentDetail"/>
          </el-dialog>
          <el-button type="primary" size="mini" @click="showContent(scope.row.content)">查看</el-button>
        </template>
      </el-table-column>

      <el-table-column align="center" label="底价" prop="price"/>

      <el-table-column align="center" label="阅读数量" prop="readCount"/>

      <el-table-column align="center" label="操作" min-width="100" class-name="small-padding fixed-width">
        <template slot-scope="scope">
          <el-button v-permission="['POST /admin/topic/update']" type="primary" size="mini"
                     @click="handleUpdate(scope.row)">编辑
          </el-button>
          <el-button v-permission="['POST /admin/topic/delete']" type="danger" size="mini"
                     @click="handleDelete(scope.row)">删除
          </el-button>
        </template>
      </el-table-column>
    </el-table>

    <pagination v-show="total>0" :total="total" :page.sync="listQuery.page" :limit.sync="listQuery.limit"
                @pagination="getList"/>

    <el-tooltip placement="top" content="返回顶部">
      <back-to-top :visibility-height="100"/>
    </el-tooltip>

  </div>
</template>

<style>
  .el-dialog {
    width: 800px;
  }

  .avatar-uploader .el-upload {
    border: 1px dashed #d9d9d9;
    border-radius: 6px;
    cursor: pointer;
    position: relative;
    overflow: hidden;
  }

  .avatar-uploader .el-upload:hover {
    border-color: #20a0ff;
  }

  .avatar-uploader-icon {
    font-size: 28px;
    color: #8c939d;
    width: 120px;
    height: 120px;
    line-height: 120px;
    text-align: center;
  }

  .avatar {
    width: 145px;
    height: 145px;
    display: block;
  }
</style>

<script>
  import {batchDeleteTopic, deleteTopic, listTopic} from '@/api/topic'
  import BackToTop from '@/components/BackToTop'
  import Pagination from '@/components/Pagination' // Secondary package based on el-pagination
  import _ from 'lodash'

  export default {
    name: 'Topic',
    components: {BackToTop, Pagination},
    data() {
      return {
        list: [],
        total: 0,
        listLoading: true,
        listQuery: {
          page: 1,
          limit: 20,
          title: undefined,
          subtitle: undefined,
          sort: 'add_time',
          order: 'desc'
        },
        options: [{
          value: 'id',
          label: '按序号排序'
        }, {
          value: 'add_time',
          label: '按时间排序'
        }, {
          value: 'price',
          label: '按价格排序'
        }],
        multipleSelection: [],
        contentDetail: '',
        contentDialogVisible: false,
        downloadLoading: false
      }
    },
    created() {
      this.getList()
    },
    methods: {
      getList() {
        this.listLoading = true;
        listTopic(this.listQuery)
          .then(response => {
            this.list = response.data.data.list;
            this.total = response.data.data.total;
            this.listLoading = false
          })
          .catch(() => {
            this.list = [];
            this.total = 0;
            this.listLoading = false
          })
      },
      handleFilter() {
        this.listQuery.page = 1;
        this.getList()
      },
      handleCreate() {
        this.$router.push({path: '/promotion/topic-create'})
      },
      handleUpdate(row) {
        this.$router.push({path: '/promotion/topic-edit', query: {id: row.id}})
      },
      handleDelete(row) {
        deleteTopic(row)
          .then(response => {
            this.$notify.success({
              title: '成功',
              message: '删除专题成功'
            });
            const index = this.list.indexOf(row);
            this.list.splice(index, 1)
          })
          .catch(response => {
            this.$notify.error({
              title: '失败',
              message: response.data.errmsg
            })
          })
      },
      handleSelectionChange(val) {
        this.multipleSelection = val
      },
      showContent(content) {
        this.contentDetail = content;
        this.contentDialogVisible = true
      },
      handleBatchDelete() {
        if (this.multipleSelection.length === 0) {
          this.$message.error('请选择至少一条记录');
          return
        }
        const ids = [];
        _.forEach(this.multipleSelection, function (item) {
          ids.push(item.id)
        });
        batchDeleteTopic({ids: ids})
          .then(response => {
            this.$notify.success({
              title: '成功',
              message: '批量删除专题成功'
            });
            this.getList()
          })
          .catch(response => {
            this.$notify.error({
              title: '失败',
              message: response.data.errmsg
            })
          })
      },
      handleDownload() {
        this.downloadLoading = true;
        import('@/vendor/Export2Excel').then(excel => {
          const tHeader = [
            '专题ID',
            '专题标题',
            '专题子标题',
            '专题内容',
            '专题图片',
            '商品低价',
            '阅读量',
            '专题商品'
          ];
          const filterVal = [
            'id',
            'title',
            'subtitle',
            'content',
            'picUrl',
            'price',
            'readCount',
            'goods'
          ];
          excel.export_json_to_excel2(tHeader, this.list, filterVal, '专题信息');
          this.downloadLoading = false
        })
      }
    }
  }
</script>
